中置曝气活性炭滤池的出水水质安全性研究

Research on Water Quality Safety in Mid-positioning Aerated Biological Activated Carbon Process

针对北江源水情况,以中置曝气活性炭工艺代替臭氧/活性炭工艺,在砂滤池前采用氯+臭氧的联合消毒方式,通过分析出水中微型水生动物、微生物、消毒副产物、可同化有机碳(AOC)、浊度等指标,探讨中置曝气活性炭工艺的出水水质安全性。结果表明,该工艺可基本消除传统臭氧/活性炭工艺存在的出水微型水生动物泄漏风险;采用氯+臭氧联合消毒,在提高消毒能力的同时,维持水中持续消毒效果,可有效控制出水微生物量;氯化与臭氧化的消毒副产物浓度均可较好地控制在《生活饮用水卫生标准》(GB 5749—2006)的限值内;通过二次絮凝工艺,控制臭氧消毒投加量在1 mg/L以内有利于保障水质微生物安全性。

On account of Beijiang River source water, using mid-positioning aerated BAC process instead of O3/BAC process and adding ozone and chlorine into the sand filter influent for combined disin- fection, the finished water quality safety was evaluated through the aspects of micro aquatic animal, mi- croorganisms, DBPs, AOC and turbidity. The results showed that the new process could well solve the problem of micro aquatic animal leakage in the traditional O3/BAC process; by adopting the combined disinfection with ozone and chlorine, microorganisms could be well removed while enhancing the disinfec- tion efficiency and keeping the residual chlorine in water; the DBPs could be well controlled to satisfy the requirements of Standards for Drinking Water Quality （ GB 5749 - 2006 ） ; and both secondary floccula- tion and adding dosage of ozone within 1 mg/L were beneficial to ensure the water microbial safety.